Question: function problem

Dear Community,

I would like to calculate a rather sophisticated function (see it in the attachmenet) Once I try to evaluate it at certain values I get the error message:

"Error (in pD) illegal use of an object as a name" 

What object Maple means? I guess its a minor mistake, yet I'm lost here, and the online help says "There is no help page available for this error"

Tx for the kind help in advance,


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